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RFB18 (Gen1) RDB17 (1:9 )
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Discussion Starter · #1 ·
I'm curious about people experiences using a supressor on the Rfb (308) or the Rdb (556).

I recently got an Hxwrx 30 cal can and have only shot it on the Rdb.I had a 4inch poi shift (high) at 100 yards (it was also in the low 30 degrees outside).
I also found I could open the gas up 2 clicks from b+6 to b+8 before I induced cycling issues.

What's your experience?
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I got a ridiculous poi shift at 40 yards with my RDB. If I tell you how much it was you'll call me a liar. Totally unusable. I might contact Keltec but I haven't yet years later.
 

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RFB18 (Gen1) RDB17 (1:9 )
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Discussion Starter · #3 ·
I got a ridiculous poi shift at 40 yards with my RDB. If I tell you how much it was you'll call me a liar. Totally unusable. I might contact Keltec but I haven't yet years later.
What variant rdb and what supressor?
(I also would never call you a liar)
Im just curios if the way the gun is causes a poi shift or if its certain heavier supressors.
I know direct thread seems to cause the least in zero shift even on the rdb.
 

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I’m curious which variant of RDB as well… the survival model’s barrel is so thin I can’t imagine it’d take the weight of a heavy suppressor well.
I agree. I think a lightweight suppressor is the way to go with these.

I've only shot my Survival with a Turbo K. The YHM Turbos are fairly high back pressure but I didn't get a lot of gas in the face. So I don't think a low back pressure at the expense of weight is the way to go here.

I use DA Xeno to mount mine. I've never put it on paper other to zero it with the can on. I don't ever plan to shoot it unsuppressed. But I did once remove the can to test POI shift unsuppressed on a 8" steel gong at 100y and was still hitting it fine.
 

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When I bought mine there was only one model if I remember correctly. I think it has a 17 or 18" barrel. The can is a Surefire 5.56k sealed unit. I can move the can to other rifles and the POI shift isn't even worth considering. I put the can on a 16" pencil barrel (my worst case) and the impact shift doesn't exist and groups shrink slightly.

I think the problem with my RDB is a lousy threading job but that's just a guess. Rather than playing the "Is this barrel good" game and sending the gun back and forth until I got a good one I just gave up and never tried to get it right. The birdcage flash hider is back in place. It's not exactly a loss because I do like the RDB being short. I would like having the option though.

I got curious about the model and just checked to see if I could nail it down better. All it says on the furniture is RDB. I know it doesn't have a 20" barrel.

The POI shift? It was so extreme that I thought I was getting baffle strikes. But I didn't see any. I think it was 6 or 8" at 40 yards. It's been awhile, but it was at least 6".
 

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Shouldn't need a piston on a rifle. In fact it could cause issues over time. The piston disconnects the can from the pistol barrel and adds energy to it so that the slide is forced back. That isn't needed in a rifle where the barrel is stationary. It could also negatively affect the threads. Try direct threading the can to a rifle barrel or use a 3 lug QC or other proprietary QC.

Yes, I know folks locally who use pistons where they aren't needed and I try to convince them. I have no idea if my convincing works or not. But research it yourself.

FWIW, the Surefire can that I wrote about above used a timed Surefire QC adapter.
 

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RFB18 (Gen1) RDB17 (1:9 )
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Discussion Starter · #13 · (Edited)
Shouldn't need a piston on a rifle. In fact it could cause issues over time. The piston disconnects the can from the pistol barrel and adds energy to it so that the slide is forced back. That isn't needed in a rifle where the barrel is stationary. It could also negatively affect the threads. Try direct threading the can to a rifle barrel or use a 3 lug QC or other proprietary QC.

Yes, I know folks locally who use pistons where they aren't needed and I try to convince them. I have no idea if my convincing works or not. But research it yourself.

FWIW, the Surefire can that I wrote about above used a timed Surefire QC adapter.
LOL it just replaces the one already in it (RFB 18).
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I get a POI shift of about 4”-6” at 50 yards with a normal suppressor on my RDB-S (Dead Air Sandman K). I ended up using a little form 1 mini can that is basically a large blast chamber with a single end cone and that has a fairly minimal POI shift. Keeps the gun short and light and basically just makes it so your ears don't ring if you have to shoot it unsuppressed.
 
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